Sync is VERY SLOW

I have a problem when I sync with rclone v1.68.2 arm64.

When I sync with

rclone sync /media/nas/Προγράμματα /media/external/Προγράμματα --dry-run --track-renames --track-renames-strategy modtime --progress --transfers 1 --checkers 1 --size-only --log-file log-with-size.log

synchronization finishes in 0.3seconds according to log.

When I sync with

rclone sync /media/nas/Προγράμματα /media/external/Προγράμματα --dry-run --track-renames --track-renames-strategy modtime --progress --transfers 1 --checkers 1 --size-only --log-file log-with-size.log

synchronization finishes in 0.3seconds according to log.
Log is

2024/11/29 19:39:51 NOTICE: Config file "/root/.config/rclone/rclone.conf" not found - using defaults
2024/11/29 19:39:51 NOTICE: Windows 10 (current)/Οδηγοί/Λοιπές Συσκευές/Samsung CLP-320 Laser Printer/Samsung CLP320 Service Manual.pdf: Skipped copy as --dry-run is set (size 14.692Mi)
2024/11/29 19:39:51 NOTICE: Windows 10 (current)/Οδηγοί/Λοιπές Συσκευές/Samsung CLP-510 Laser Printer/UPD_Guide_EN.pdf: Skipped move as --dry-run is set (size 1.060Mi)
2024/11/29 19:39:51 NOTICE: Windows 10 (current)/Οδηγοί/Λοιπές Συσκευές/Samsung CLP-320 Laser Printer/Samsung CLP320 User's Manual.pdf: Skipped copy as --dry-run is set (size 16.552Mi)
2024/11/29 19:39:51 NOTICE: Windows 10 (current)/Οδηγοί/Λοιπές Συσκευές/Samsung CLP-510 Laser Printer/SamsungUniversalPrintDriver3.exe: Skipped move as --dry-run is set (size 27.206Mi)
2024/11/29 19:39:51 NOTICE: Windows 10 (current)/Οδηγοί/Λοιπές Συσκευές/Samsung CLP-320 Laser Printer/Samsung_CLP_320-325.pdf: Skipped delete as --dry-run is set (size 14.692Mi)
2024/11/29 19:39:51 NOTICE: Windows 10 (current)/Οδηγοί/Λοιπές Συσκευές/Samsung CLP-320 Laser Printer/readme.txt: Skipped delete as --dry-run is set (size 94)
2024/11/29 19:39:51 NOTICE:
Transferred:       59.509 MiB / 59.509 MiB, 100%, 0 B/s, ETA -
Checks:              1897 / 1897, 100%
Deleted:                2 (files), 0 (dirs), 14.692 MiB (freed)
Renamed:                2
Transferred:            2 / 2, 100%
Elapsed time:         0.2s

When I sync with

rclone sync /media/nas/Προγράμματα /media/external/Προγράμματα --dry-run --track-renames --track-renames-strategy modtime --progress --transfers 1 --checkers 1 --log-file log-with-modtime.log

synchronization needs A LOT OF TIME and I break it with Ctrl-C after a few minutes.
Log is:

2024/11/29 19:33:37 NOTICE: Config file "/root/.config/rclone/rclone.conf" not found - using defaults
2024/11/29 19:33:37 NOTICE: Android/Apps/F-Droid Packages/de.blinkt.openvpn_193.apk: Skipped update modification time as --dry-run is set (size 35.598Mi)
2024/11/29 19:33:37 NOTICE: Windows 10 (current)/Οδηγοί/Λοιπές Συσκευές/Samsung CLP-510 Laser Printer/UPD_Guide_EN.pdf: Skipped move as --dry-run is set (size 1.060Mi)
2024/11/29 19:33:37 NOTICE: Windows 10 (current)/Οδηγοί/Λοιπές Συσκευές/Samsung CLP-510 Laser Printer/SamsungUniversalPrintDriver3.exe: Skipped move as --dry-run is set (size 27.206Mi)
2024/11/29 19:33:37 NOTICE: Windows 10 (current)/Οδηγοί/Λοιπές Συσκευές/Samsung CLP-320 Laser Printer/Samsung CLP320 Service Manual.pdf: Skipped copy as --dry-run is set (size 14.692Mi)
2024/11/29 19:33:37 NOTICE: Windows 10 (current)/Οδηγοί/Λοιπές Συσκευές/Samsung CLP-320 Laser Printer/Samsung CLP320 User's Manual.pdf: Skipped copy as --dry-run is set (size 16.552Mi)
2024/11/29 19:33:38 NOTICE: Android/Apps/F-Droid Packages/net.osmand.plus_4206.apk: Skipped update modification time as --dry-run is set (size 125.489Mi)
2024/11/29 19:33:39 NOTICE: Android/Apps/F-Droid Packages/org.mozilla.fennec_fdroid_1031020.apk: Skipped update modification time as --dry-run is set (size 75.538Mi)
2024/11/29 19:33:39 NOTICE: Android/Apps/F-Droid Packages/org.telegram.messenger_27219.apk: Skipped update modification time as --dry-run is set (size 66.863Mi)
2024/11/29 19:33:39 NOTICE: Android/Apps/F-Droid Packages/org.videolan.vlc_13040408.apk: Skipped update modification time as --dry-run is set (size 33.588Mi)
2024/11/29 19:33:41 NOTICE: Android/Κινητά/Samsung Galaxy Mini 2 GT-S6500/How to Install CyanogenMod 11 Stable On Galaxy Mini 2.mp4: Skipped update modification time as --dry-run is set (size 173.946Mi)
2024/11/29 19:33:42 NOTICE: Android/Κινητά/Samsung Galaxy Mini 2 GT-S6500/Spec-Gapps-4.4.4-Basic-V2.1.zip: Skipped update modification time as --dry-run is set (size 147.826Mi)
2024/11/29 19:33:43 NOTICE: Android/Κινητά/Samsung Galaxy Mini 2 GT-S6500/omni-4.4.4-20180817-jena-HOMEMADE.zip: Skipped update modification time as --dry-run is set (size 145.986Mi)
2024/11/29 19:33:43 NOTICE: Android/Κινητά/Samsung Galaxy Mini 2 GT-S6500/twrp-3.0.2-0-odin.img: Skipped update modification time as --dry-run is set (size 11.043Mi)
2024/11/29 19:34:14 NOTICE: Windows 11/Διανομές/Windows 11 22H2 Pro 3in1 OEM ESD en-US DEC 2022/W11PRO.22H2.EN-US.DEC2022.ISO: Skipped update modification time as --dry-run is set (size 4.369Gi)
2024/11/29 19:34:23 NOTICE: Linux/x86-64/Διανομές/HBCD_PE_x64.iso: Skipped update modification time as --dry-run is set (size 1.262Gi)
2024/11/29 19:34:26 NOTICE: Linux/x86-64/Διανομές/gparted-live-1.4.0-6-amd64.iso: Skipped update modification time as --dry-run is set (size 484Mi)
2024/11/29 19:34:26 NOTICE: Windows 11/Διανομές/Windows 11 22H2 Pro 3in1 OEM ESD en-US DEC 2022/INFO/Install info regarding online account requirement.txt: Skipped update modification time as --dry-run is set (size 159)
2024/11/29 19:34:26 NOTICE: Windows 11/Διανομές/Windows 11 22H2 Pro 3in1 OEM ESD en-US DEC 2022/INFO/Windows 11 22H2 Pro 3in1 OEM ESD en-US DEC 2022 {Gen2}.txt: Skipped update modification time as --dry-run is set (size 1.379Ki)
2024/11/29 19:34:45 NOTICE: Linux/x86-64/Διανομές/Debian/debian-live-11.6.0-amd64-lxde.iso: Skipped update modification time as --dry-run is set (size 2.589Gi)
2024/11/29 19:34:45 NOTICE: Windows 11/Διανομές/Windows 11 22H2 Pro 3in1 OEM ESD en-US DEC 2022/Rufus USB-tool/Rufus 3.21.exe: Skipped update modification time as --dry-run is set (size 1.333Mi)
2024/11/29 19:34:45 NOTICE: Windows 10 (current)/Ήχος/Hardware/Virtual Audio Cable v4.60.0.10191 Retail.7z: Skipped update modification time as --dry-run is set (size 517.670Ki)
2024/11/29 19:34:45 NOTICE: Windows 10 (current)/Δίκτυο/Cloud Storage/MEGAsyncSetup64.exe: Skipped update modification time as --dry-run is set (size 33.462Mi)
2024/11/29 19:34:45 NOTICE: Windows 11/Διανομές/Windows 11 22H2 Pro 3in1 OEM ESD en-US DEC 2022/[ TeamOS ]/Check out our Stuff.url: Skipped update modification time as --dry-run is set (size 427)
2024/11/29 19:34:45 NOTICE: Windows 11/Διανομές/Windows 11 22H2 Pro 3in1 OEM ESD en-US DEC 2022/[ TeamOS ]/TeamOS.xyz.url: Skipped update modification time as --dry-run is set (size 113)
2024/11/29 19:34:45 NOTICE: Windows 11/Διανομές/Windows 11 22H2 Pro 3in1 OEM ESD en-US DEC 2022/[ TeamOS ]/TeamOS.xyz_Logo.png: Skipped update modification time as --dry-run is set (size 10.829Ki)
2024/11/29 19:34:45 NOTICE: Windows 11/Διανομές/Windows 11 22H2 Pro 3in1 OEM ESD en-US DEC 2022/[ TeamOS ]/TeamOS_FAQ.jpg: Skipped update modification time as --dry-run is set (size 83.479Ki)
2024/11/29 19:34:45 NOTICE: Windows 11/Διανομές/Windows 11 22H2 Pro 3in1 OEM ESD en-US DEC 2022/[ TeamOS ]/Torrent downlaod from teamos.xyz.txt: Skipped update modification time as --dry-run is set (size 39)
2024/11/29 19:34:45 NOTICE: Windows 11/Διανομές/Windows 11 22H2 Pro 3in1 OEM ESD en-US DEC 2022/[ TeamOS ]/VBuwuLG.png: Skipped update modification time as --dry-run is set (size 22.854Ki)
2024/11/29 19:34:45 NOTICE: Windows 11/Διανομές/Windows 11 22H2 Pro 3in1 OEM ESD en-US DEC 2022/[ TeamOS ]/for Bitcoin users.txt: Skipped update modification time as --dry-run is set (size 114)
2024/11/29 19:34:46 NOTICE: Android/Κινητά/Xiaomi/Mi Flash/miflash_unlock-en-3.5.1128.45.zip: Skipped update modification time as --dry-run is set (size 48.083Mi)
2024/11/29 19:34:46 NOTICE: Windows 10 (current)/Video/Subtitles/Jubler-7.0.3.x64.exe: Skipped update modification time as --dry-run is set (size 25.209Mi)
----- Ctrl-C -----

Probably option --checksum is by default enabled which is wrong because sync by default has enabled the modtime and size

hi,

as a test,

  1. pick a single file, such as org.videolan.vlc_13040408.apk
  2. post the output of rclone lsf --format=pth, for both, the source file and for the dest file

If I understand correctly, you need this:

root@ODROID-HC4:~# rclone lsf /media/external/Προγράμματα/Android/Apps/F-Droid\ Packages/org.videolan.vlc_13040408.apk   --format=pth
2024/11/29 23:57:03 NOTICE: Config file "/root/.config/rclone/rclone.conf" not found - using defaults
org.videolan.vlc_13040408.apk;2022-08-11 21:34:19;063ca7e85ea251920d90aaef7a757f37
root@ODROID-HC4:~# rclone lsf /media/nas/Προγράμματα/Android/Apps/F-Droid\ Packages/org.videolan.vlc_13040408.apk   --format=pth
2024/11/29 23:57:16 NOTICE: Config file "/root/.config/rclone/rclone.conf" not found - using defaults
org.videolan.vlc_13040408.apk;2022-08-11 21:34:19;063ca7e85ea251920d90aaef7a757f37